20 Domains 12 Stacks BM25 Search Python 3.8+ Zero Dependencies MIT License

// Staff-Engineer-in-a-Box

Backend Pro Max
Design Intelligence

Curated, BM25-searchable backend & distributed-systems intelligence across 20 domains and 12 language stacks — drop it into Claude Code, Cursor, Copilot, or any AI assistant.

Get on GitHub How it works ↓ View Domains →

bash — backend-pro-max

$ pip install backendpro

Successfully installed backend-pro-max-skill

$ backendpro "kafka exactly once delivery"

domain: messaging score: 0.94
do: Use transactional.id + enable.idempotence=true
don't: Rely on at-least-once for financial events
severity: CRITICAL

$ backendpro "circuit breaker" --stack python-fastapi

stack: python-fastapi lib: circuitbreaker / tenacity
do: Wrap outbound HTTP, not inbound routes

// Knowledge Base

20 Backend Domains

Every domain contains opinionated, source-citable, staff-engineer-grade rows with Do / Don't examples and severity ratings.

🧩

pattern

Saga, CQRS, Outbox, Circuit Breaker, Bulkhead, Idempotency, Leader Election, Rate Limiting, Sharding

22 patterns

🗄️

database

Postgres, MongoDB, Cassandra, DynamoDB, Redis, ClickHouse, vector DBs, S3, etcd

20+ engines

📨

messaging

Kafka, Redpanda, Pulsar, RabbitMQ, NATS, SQS, SNS, Kinesis, Pub/Sub

12 brokers

⚡

cache

In-process LRU, Redis cluster, Memcached, CDN, negative caching, Bloom filters, L1+L2 hybrid

10 strategies

☁️

cloud

AWS / GCP / Azure / Cloudflare service mapping and equivalents across all major primitives

3 providers

📊

observability

Prometheus, Grafana, Loki, Tempo, OpenTelemetry, Pyroscope, SLO frameworks, Datadog

15+ tools

🛡️

security

OWASP Top 10, CSRF, SSRF, supply chain (SLSA, Sigstore), zero-trust, TLS, PII, SAST

Critical severity

🔑

auth

OAuth 2.0+PKCE, OIDC, JWT, SAML, mTLS, passkeys, RBAC/ABAC/ReBAC, SCIM, workload identity

12 mechanisms

🔌

api

REST, GraphQL, gRPC, WebSocket, SSE, HTTP/2+3, Webhooks, JSON-RPC

10 protocols

📦

container

Docker, Kubernetes, EKS/GKE/AKS, Helm, ArgoCD, Istio, Envoy, Karpenter

20+ tools

⚖️

consistency

Linearizability, CAP, PACELC, Raft, Paxos, 2PC, snapshot isolation, Lamport clocks

8 models

🛟

reliability

SLO/SLI/error budget, timeouts, retries, circuit breaker, graceful shutdown, chaos engineering

18 practices

📈

scaling

Autoscaling (HPA/KEDA), sharding, backpressure, hedged requests, geo-distribution, CDN

16 techniques

🚀

performance

N+1, GC pauses, hot keys, tail latency, thundering herd, cold starts, TLS overhead

14 anti-patterns

🧪

testing

Unit, integration (Testcontainers), contract (Pact), fuzz, mutation, chaos, load, smoke

10 types

🏛️

architecture

Monolith, microservices, serverless, event-driven, hexagonal, DDD, CQRS+ES, cell-based

12 styles

🔁

cicd

GitHub Actions, GitLab CI, ArgoCD, Flux, Argo Rollouts, Renovate, SonarQube, GHAS

15+ tools

🏗️

iac

Terraform/OpenTofu, Pulumi, AWS CDK, CloudFormation, Bicep, Ansible, Crossplane, Helm

9 tools

🧮

data

Spark, Flink, Kafka Streams, dbt, Airflow, Iceberg/Delta/Hudi, Debezium, vector DBs

20+ tools

🧠

language

Go, Java, Kotlin, Python, Rust, Node.js/TS, C#, Scala, Elixir, Ruby, PHP, C++

12 languages

// Stack Guidelines

12 Language Stacks

What would a staff engineer say in code review? Opinionated Do / Don't with real code examples, per stack.

🐹

context.Context, errgroup, pgx/sqlc

concurrencyhttptesting

☕

Java / Spring

Virtual threads (Loom), constructor DI

loomflywaynative

🐍

Python / FastAPI

async-all-the-way, Pydantic v2, uv

asyncruffstructlog

🟢

Node / Express

Fastify > Express, zod, pino, Vitest

fastifyotelundici

🦀

Rust / Axum

Tokio + Tower, sqlx compile-time queries

tokiotracingthiserror

🟪

C# / ASP.NET

Minimal APIs, Polly v8, Native AOT

minimal-apief-coreaot

🟧

Kotlin / Spring

Coroutines, structured concurrency, kotest

coroutinesjooqkotest

🔺

Scala / Akka

Pekko, Typed actors, Cats Effect / ZIO

pekkostreamszio

💧

Elixir / Phoenix

OTP, GenServer, Broadway, libcluster

otpliveviewbroadway

💎

Ruby / Rails

Modular Rails, Sidekiq, Solid Queue

packwerkpumabullet

🐘

PHP / Laravel

Octane (Swoole/FrankenPHP), PHPStan

octanehorizonopcode

➕

C++

C++20, RAII, jthread, sanitizers, CMake

c++20conanclang-tidy

// Workflow

How AI agents use this

From prompt to production-grade, cited advice in 5 intelligent steps. The model searches before answering.

Your Prompt

You ask your AI assistant a backend question. Natural language, no special syntax needed.

Domain Detection

The skill detects which domain applies — messaging, reliability, pattern, stack — from your query automatically.

BM25 Search

Pure Python BM25 ranks rows across 20 domain CSVs. No network, no model, no install. Just python3.

Cited Answer

The model answers with the right library, code pattern, and a citation to the exact row. Reviewers can verify.

Cross-domain Synthesis

Complex queries pull from multiple domains — a saga answer combines pattern + messaging + consistency + reliability.

— user prompt

# Your question to the AI assistant

You:

"Add retries to our outbound HTTP client
without melting the dependency.
We're using Python + FastAPI."

# Any natural language works.

# No special syntax required.

# Auto-detection from query keywords

query_keywords: ["retry", "http", "circuit"]

detected_domains:

✓ reliability — score 0.91

✓ pattern — score 0.84

✓ stack — python-fastapi

# Skip --domain and engine picks it.

# Pure Python BM25 — no installs

$ backendpro "retry backoff jitter" \

--domain reliability \

--stack python-fastapi

Searching reliability.csv …

✓ row: retry-exponential-jitter

✓ score: 0.96

✓ severity: HIGH

# Model answers with citation

Answer (reliability › retry-backoff-jitter):

✓ Do: Use tenacity with exponential

backoff + full jitter. Wrap only

outbound calls, not route handlers.

✗ Don't: Retry on 4xx. Cap at

3 attempts with a budget timeout.

lib: tenacity + httpx

# Saga pulls 4 domains at once

$ backendpro "saga distributed tx" --all

Cross-domain synthesis:

✓ pattern → choreography vs orchestration

✓ messaging → outbox + idempotent consumers

✓ consistency→ eventual, not 2PC

✓ reliability→ compensating transactions

// Get Started

Drop into any AI tool

One skill file, six assistants. Symlink, copy, or install — the skill instructs the model to search before answering.

🟣 Claude Code

Symlink into .claude/skills/

mkdir -p .claude/skills
ln -s "$(pwd)/src/backend-pro-max" \
.claude/skills/backend-pro-max

🟦 Cursor

Copy skill-content.md to rules file

cp skill-content.md \
.cursor/rules/backend.mdc

🌊 Windsurf

Add to .windsurfrules

cp skill-content.md .windsurfrules

🐙 GitHub Copilot

Add to copilot-instructions.md

cp skill-content.md \
.github/copilot-instructions.md

🔷 Continue

Add to AGENTS.md

cp skill-content.md AGENTS.md

⚙️ CLI / MCP

Install globally via pip

pip install git+https://github.com/\
shashankswe2020-ux/\
backend-pro-max-skill

backendpro "redis cluster" --json

Backend Pro Max Design Intelligence

20 Backend Domains

12 Language Stacks

How AI agents use this

Drop into any AI tool

Stop guessing. Start citing.

Backend Pro Max
Design Intelligence